Outline a plot of land on a map

Geographic Information Systems Asked by Charles Okwuagwu on January 7, 2021

A client has a very old Certificate of Ownership document for a plot of land.
We need to show the outline of the plot on Google maps to potential developers.

Sadly the description of the plot is in archaic coordinate system. How do I get this represented on Google maps?

Here is an additional piece of information I could scrape from the document:

Those are some form of coordinates for point A.4589 in the diagram.

Seems I’ve made some good progress

Map Location

You need to know the coordinates of at least one point in lat/lon degrees. If you don't have any surveying points, you might take coordinates from a GPS unit if the point is visible.

Using QGIS, you could create the other points of the polygon with the Azimuth and Distance Plugin. Take care to convert the degree-minute bearings into decimal degrees.

With the additional Information, it is easy to locate the points next to the Abuja-Kaduna Highway. I have taken the Nigerian Minna Datum with UTM 32N EPSG:26332. The accuracy of the Minna datum is reported to be about 3 to 6 meters.

For use in Google Earth, you can convert the corner points into KML format in a last step:

<?xml version="1.0" encoding="utf-8" ?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document id="root_doc">
<Folder><name>corners</name>
<Placemark>
<name>A.4589</name>
<MultiGeometry><Point><coordinates>7.213681182925083,9.242681685792601</coordinates></Point></MultiGeometry>
</Placemark>
<Placemark>
<name>A.4590</name>
<MultiGeometry><Point><coordinates>7.21464061889053,9.244143155822583</coordinates></Point></MultiGeometry>
</Placemark>
<Placemark>
<name>A.4591</name>
<MultiGeometry><Point><coordinates>7.215811177177327,9.243701475697776</coordinates></Point></MultiGeometry>
</Placemark>
<Placemark>
<name>A.4592</name>
<MultiGeometry><Point><coordinates>7.215774243544854,9.242327697539729</coordinates></Point></MultiGeometry>
</Placemark>
<Placemark>
<name>A.4593</name>
<MultiGeometry><Point><coordinates>7.214939943530562,9.242397736493757</coordinates></Point></MultiGeometry>
</Placemark>
</Folder>
</Document></kml>


Correct answer by AndreJ on January 7, 2021

There is a free online tool at Underhill's map check page

I used your metes data, but started at A.4589 (the one with known coordinates) and got these results (the remaining point numbers are assumed to increase by one each time, and luckily they do match the raw data numbering):

Azimuth Distance        Pt#     Northing    Easting
4589    22054.320   3837.680
33 24 00   193.000     4590    22215.446   3943.923
111 05 00   137.600     4591    22165.947   4072.312
181 49 00   152.010     4592    22014.014   4067.493
275 07 00    92.010     4593    22022.220   3975.849
283 06 00   141.800     4589    22054.359   3837.740
Misclosure          0.039      0.060
Precision      1 : 10085
Area =      31432.0


An actual screen shot:

Answered by Martin F on January 7, 2021

These are the coordinates from Ukwu-Oba that have been planted. Pt"A"(1) 6.11931381N 6.50480513E or Lat.6° 03'23."N Long.6°.30'26.8"E pt.(2) 6.0571400N 6.5071078E and 6°.03'16.7"N 6°30"25•6'E pt(3)6•0568894N 6•5076962E (pt4)6•056840N 6•508229E .(pt5) B∆~start to C∆6•054706N 6•510544E C2;-6•059036N 6•510204E close up to Highway. Adonte Rd. Start D to A 6•056184N 6•506191E (2)6•054366N 6•504388E D3~6•051124N 6•506296E D4~6•051246N 6•509158E loop to C, and A.end. 6°03' 23"•0N 6°30'26"•8 E. Loop closure.

Answered by Chukwuma Nwose on January 7, 2021